In this paper there is presented a discussion of the tinting strength of pigments. It is not primarily proposed herein to offer a new method for estimating and expressing tinting strength, but rather to aid in clarifying ideas on the subject, so that when the science of colorimetrics has been further advanced a rational means for appraising this valuable property may be the more easily developed. The necessity for considering the tinting strength of chromatic pigments as a two-factor property is shown. A distinction between the tinting strength of whites and of blacks is drawn. New names for three differentiated factors involved in tinting are offered, namely, chromatic, darkening, and brightening strengths. A method for treating these properties photometrically or spectrophotometrically and of indicating their relative magnitude by numerical indices is suggested. Tabular and graphical data are presented. In connection with and incidental to the subject of tinting, certain empirical formulas have been developed in the argument which may be used for computing the proper mixture of white pigment with pigment of another color in order to obtain a tint of some desired brightness or colorimetric purity. The procedure employed in this work for specifying color in the monochromatic terms of dominant wave length, purity, and brightness is set forth with concise explanation in an appendix.
Bur. Stand. J. Res. Vol. 1, No. 2 , p. 125
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